Klein: Well, I think there is a very a deep denialism in the environmental movement among the Big Green groups. And to be very honest with you, I think it’s been more damaging than the right-wing denialism in terms of how much ground we’ve lost. Because it has steered us in directions that have yielded very poor results. I think if we look at the track record of Kyoto, of the UN Clean Development Mechanism, the European Union’s emissions trading scheme – we now have close to a decade that we can measure these schemes against, and it’s disastrous. Not only are emissions up, but you have no end of scams to point to, which gives fodder to the right. The right took on cap-and-trade by saying it’s going to bankrupt us, it’s handouts to corporations, and, by the way, it’s not going to work. And they were right on all counts. Not in the bankrupting part, but they were right that this was a massive corporate giveaway, and they were right that it wasn’t going to bring us anywhere near what scientists were saying we needed to do lower emissions.

The total accumulative effect of man-emitted CO2 through three centuries of the industrial revolution may be 10-30 percent of the soot effect claimed in this paper, an effect that our 19th century ancestors didn't even know (and care) about.